DE340360C - Process for the production of highly concentrated nitric acid from nitrogen tetroxide, oxygen and water - Google Patents
Process for the production of highly concentrated nitric acid from nitrogen tetroxide, oxygen and waterInfo
- Publication number
- DE340360C DE340360C DE1919340360D DE340360DD DE340360C DE 340360 C DE340360 C DE 340360C DE 1919340360 D DE1919340360 D DE 1919340360D DE 340360D D DE340360D D DE 340360DD DE 340360 C DE340360 C DE 340360C
- Authority
- DE
- Germany
- Prior art keywords
- nitric acid
- oxygen
- water
- production
- highly concentrated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/24—Nitric oxide (NO)
- C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Description
Nach der deutschen Patentschrift 225706 ist es bekannt, konzentrierte Salpetersäure aus Stickstofftetroxyd, Wasser und Sauerstoff dadurch herzustellen, daß man in einem Autoklaven die Komponenten unter Druck aufeinander einwirken läßt. Wenn indessen der Prozeß, wie in der Patentschrift angegeben, ausgeführt wird, erhält man nicht in passender Zeit eine o,8prozentige Salpetersäure, sondem nur 85prozentige Säure.According to German patent specification 225706 it is known to make concentrated nitric acid Nitrogen tetroxide, water and oxygen can be produced by placing them in an autoclave allows the components to act on one another under pressure. If, however, as indicated in the patent specification, the process is carried out, you will not get a 0.8 percent nitric acid in the appropriate time, but only 85 percent acid.
Es wurde nun beobachtet, daß selbst eine weitgehende Druckerhöhung für sich allein die Säurekonzentration über 90 Prozent nicht steigern kann.It has now been observed that even a far-reaching increase in pressure for itself alone Cannot increase acid concentration above 90 percent.
Dagegen wurde gefunden, daß man eine 97prozentige Säure mit guter Ausbeute und in kurzer Reaktionszeit darstellen kann, wenn man auch die Temperatur erhöht. Als geeignete Temperatur hat sich etwa 700C er-In contrast, it has been found that a 97 percent acid can be produced with good yield and in a short reaction time if the temperature is also increased. A suitable temperature has proven to be about 70 0 C
2Q wiesen. Zwar ist es bekannt, daß chemische Reaktionen in der Regel mit größerer Geschwindigkeit bei höherer Temperatur als bei niedriger verlaufen, aber gerade im vorliegenden Falle hat man es bis jetzt sehr sorgfältig vermieden, die Temperatur zu erhöhen, vielmehr während der Reaktion gekühlt, indem man annahm, daß die höchste Konzentration bei bester Ausbeute nur bei niedriger Temperatur erhalten werde, weil die Dissociation der Salpetersäure und des Stickstoffoxyds bei niedriger Temperatur sehr gering ist.2Q pointed. Although it is known that chemical Reactions usually faster at higher temperatures than at run lower, but especially in the present case one has worked very carefully up to now avoided increasing the temperature, rather cooled by adding during the reaction it was assumed that the highest concentration with the best yield only at low temperature obtained because the dissociation of nitric acid and nitric oxide low temperature is very low.
Den Gegenstand der Erfindung bildet nun die Beobachtung, daß sowohl die Ausbeute wie die Konzentration der, Säure wider Erwarten steigt, wenn man bei höherer Temperatur arbeitet, obgleich die Dissociation der Salpetersäure und des Stickstoffoxydes dadurch zunimmt. Die Dissociation kompensiert man 'zweckmässig durch gleichzeitige Steigerung des Druckes, so daß der Arbeitsdruck denjenigen Druck übersteigt, den das Stickstofftetroxyd bei der Reaktionstemperatur haben würde. Als zweckmäßig hat sich ein Druck von etwa 20 Atm. erwiesen. Man kann so die Reaktion in sehr kurzer Zeit durchführen und erhält gleichzeitig ohne Schwierigkeiten eine hochprozentige Salpetersäure in großer Ausbeute, auf das gebrauchte Stickstofftetroxyd gerechnet. Dadurch daß die Reaktionszeit wesentlich herabgesetzt ist, ist es möglich, den Prozeß kontinuierlich und in technisch bequemer Weise durchzuführen.The object of the invention now forms the observation that both the yield like the concentration of the acid, contrary to expectation, increases when one is at a higher temperature works, although the dissociation of nitric acid and nitric oxide thereby increases. The dissociation is expediently compensated by a simultaneous increase in the Pressure, so that the working pressure exceeds that pressure, which the nitrogen tetroxide would have at the reaction temperature. A pressure of about 20 atm. proven. The reaction can be carried out and maintained in this way in a very short time at the same time a high percentage nitric acid in high yield without difficulty, calculated on the nitrogen tetroxide used. This significantly reduces the response time is, it is possible to carry out the process continuously and in a technically convenient manner.
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO500891X | 1917-05-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE340360C true DE340360C (en) | 1921-09-07 |
Family
ID=19885816
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1919340360D Expired DE340360C (en) | 1917-05-08 | 1919-06-15 | Process for the production of highly concentrated nitric acid from nitrogen tetroxide, oxygen and water |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE340360C (en) |
FR (1) | FR500891A (en) |
GB (1) | GB116495A (en) |
-
1918
- 1918-04-22 GB GB6769/18A patent/GB116495A/en not_active Expired
-
1919
- 1919-06-15 DE DE1919340360D patent/DE340360C/en not_active Expired
- 1919-06-21 FR FR500891A patent/FR500891A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB116495A (en) | 1918-07-22 |
FR500891A (en) | 1920-03-26 |
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